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At the same time that server-side web development was moving through an alphabet soup of technologies, a new type of programming was gaining popularity. Developers began to experiment with the different ways they could enhance web pages by embedding multimedia and miniature applets built with JavaScript, DHTML (Dynamic HTML), and Java code. These client-side technologies don t involve any server processing. Instead, the complete application is downloaded to the client browser, which executes it locally. The greatest problem with client-side technologies is that they aren t supported equally by all browsers and operating systems. One of the reasons that web development is so popular in the first place is because web applications don t require setup CDs, downloads, and other tedious (and error-prone) deployment steps. Instead, a web application can be used on any computer that has Internet access. But when developers use client-side technologies, they encounter a few familiar headaches. Suddenly, cross-browser compatibility becomes a problem. Developers are forced to test their websites with different operating systems and browsers, and they might even need to distribute browser updates to their clients. In other words, the client-side model sacrifices some of the most important benefits of web development. For that reason, ASP.NET is designed as a server-side technology. All ASP.NET code executes on the server. When the code is finished executing, the user receives an ordinary HTML page, which can be viewed in any browser. Figure 1-3 shows the difference between the server-side and the client-side model.

Figure 1-3. Server-side and client-side web applications These are some other reasons for avoiding client-side programming: Isolation: Client-side code can t access server-side resources. For example, a client-side application has no easy way to read a file or interact with a database on the server (at least not without running into problems with security and browser compatibility).

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quantity in the business tier and deciding whether the product is available based on that number (resulting in two data tier, and implicitly database, calls), you could have a single data tier method named AddProductIfAvailable that adds the product to the shopping cart only if it s available in stock In this scenario, some logic is transferred from the business tier to the data tier In many other circumstances, you might have the option to place the same logic in one tier or another, or maybe in both In most cases, there is no single best way to implement the three-tier architecture, and you ll need to make a compromise or a choice based on personal preference or external constraints Occasionally, even though you know the right way (in respect to the architecture) to implement something, you might choose to break the rules to get a performance gain.

Security: End users can view client-side code. And once malicious users understand how an application works, they can often tamper with it. Thin clients: As the Internet continues to evolve, web-enabled devices such as mobile phones, palmtop computers, and PDAs (personal digital assistants) are appearing. These devices can communicate with web servers, but they don t support all the features of a traditional browser. Thin clients can use server-based web applications, but they won t support client-side features such as JavaScript. In some cases, ASP.NET allows you to combine the best of client-side programming with server-side programming. For example, the best ASP.NET controls can intelligently detect the features of the client browser. If the browser supports JavaScript, these controls will return a web page that incorporates JavaScript for a richer, more responsive user interface. However, no matter what the capabilities of the browser, your code is always executed on the server.

try { // open the database connection myConnection.Open(); // set up SQL query for Manufacturer table myCommand.CommandText = "SELECT ManufacturerID, ManufacturerName FROM Manufacturer"; // run query SqlDataReader myReader = myCommand.ExecuteReader(); // set up the list control ListBox1.DataSource = myReader; ListBox1.DataBind(); // close the reader myReader.Close(); } finally { // always close the connection myConnection.Close(); } } } 7. Add a Click event handler for the Button. First, add the code to create the Command and Connection objects, and then open the connection: protected void Button1_Click(object sender, EventArgs e) { // create SqlConnection object string ConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; SqlConnection myConnection = new SqlConnection(ConnectionString); // create SqlCommand object SqlCommand myCommand = new SqlCommand(); myCommand.Connection = myConnection; try { // open the database connection myConnection.Open();

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